LONDON, ENGLAND - OCTOBER 21: Queen Elizabeth II (L) and Britain's Prince Philip, Duke of Edinburgh (front R) stand with Singapore's President Tony Tan Keng Yam (front 2L) and his wife Mary (front 2R), as British Prime Minister David Cameron (back 4R), Foreign Secretary Philip Hammond (3R) and Home Secretary Theresa May (2R) stand by during the ceremonial welcome ceremony for the Singaporean president at the start of a state visit at Horse Guards Parade on October 21, 2014 in London, England. The President is at the beginning of his four day stay during which he will hold a bilateral meeting with Prime Minister David Cameron. (Photo by Leon Neal - WPA Pool/Getty Images)
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